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# Tamsulosin
## Overview
Tamsulosin is an alpha-1 adrenergic receptor antagonist that relaxes smooth muscle in the prostate, bladder neck, and urethra.
## Primary Indications
* Benign Prostatic Hyperplasia (BPH) symptoms.
* Facilitation of ureteral stone passage.
## Adult Dosing
* **BPH:** 0.4 mg orally once daily. If inadequate response after 2-4 weeks, may increase to 0.8 mg once daily.
* **Ureteral Stones:** 0.4 mg orally once daily. Duration of treatment is variable and depends on stone size and location.
## Pediatric Dosing
There is no established use for tamsulosin in pediatric patients.
## Dose Adjustments
No dose adjustment is typically required for renal or hepatic impairment, though caution is advised in severe hepatic impairment.
## Contraindications
* Hypersensitivity to tamsulosin or its components.
* Concomitant use with other alpha-1 adrenergic antagonists.
## Adverse Effects
Common adverse effects include: dizziness, headache, abnormal ejaculation (including retrograde ejaculation and ejaculation failure), and rhinitis. Orthostatic hypotension, particularly upon initiation, can occur.
## Key Drug Interactions
* **CYP3A4 inhibitors (e.g., ketoconazole, ritonavir):** May increase tamsulosin exposure; use with caution.
* **Other alpha-1 blockers:** Additive hypotensive effects; generally avoid combination.
* **Antihypertensives:** May increase the risk of hypotension.
## Monitoring
* Blood pressure, especially after initiating therapy or increasing dose.
* Symptoms of BPH.
* For patients undergoing cataract surgery, intraoperative floppy iris syndrome (IFIS) can occur; inform ophthalmologists of tamsulosin use.
## Clinical Pearls
* Tamsulosin has less effect on blood pressure compared to non-selective alpha-1 blockers.
* Take consistently, either 30 minutes after the same meal each day or at bedtime, to minimize dizziness and orthostatic hypotension.
* Extended-release formulation is crucial for its dosing and safety profile.
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**Disclaimer:** This information is intended for clinical professionals. Always consult the most current prescribing information and local protocols for definitive guidance.
